[Webkit-unassigned] [Bug 195776] New: Reduce the size of Node::deref by eliminating an explicit parentNode check

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Mar 14 16:02:12 PDT 2019


https://bugs.webkit.org/show_bug.cgi?id=195776

            Bug ID: 195776
           Summary: Reduce the size of Node::deref by eliminating an
                    explicit parentNode check
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org

As discussed in https://bugs.webkit.org/show_bug.cgi?id=195661,
we can use the same strategy as String and use the lowest bit of Node::m_refCount
to indicate the pretense of a parent node.

This will reduce the load in Node::def. We can also avoid writing to m_refCount
in the case of calling removedLastRef() as we've done for RefCounted<T> in https://trac.webkit.org/r30042.

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